[ONOS-4350] Inter Jar dependency implementation and code restructuring.
Change-Id: Iacac75e4187aed93ce1754c170a9c19707e5b8c3
diff --git a/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListener.java b/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListener.java
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+++ b/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListener.java
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+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MAX_ELEMENT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * max-elements-stmt = max-elements-keyword sep
+ * max-value-arg-str stmtend
+ * max-value-arg-str = < a string that matches the rule
+ * max-value-arg >
+ *
+ * ANTLR grammar rule
+ * maxElementsStatement : MAX_ELEMENTS_KEYWORD maxValue STMTEND;
+ * maxValue : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the
+ * "max-elements" rule defined in ANTLR grammar file for corresponding ABNF rule
+ * in RFC 6020.
+ */
+public final class MaxElementsListener {
+
+ private static final String POSITIVE_INTEGER_PATTERN = "[1-9][0-9]*";
+ private static final String UNBOUNDED_KEYWORD = "unbounded";
+
+ /**
+ * Creates a new max-elements listener.
+ */
+ private MaxElementsListener() {
+ }
+
+ /**
+ * It is called when parser receives an input matching the grammar rule
+ * (max-elements), performs validation and updates the data model tree.
+ *
+ * @param listener listener's object
+ * @param ctx context object of the grammar rule
+ */
+ public static void processMaxElementsEntry(TreeWalkListener listener,
+ GeneratedYangParser.MaxElementsStatementContext ctx) {
+
+ // Check for stack to be non empty.
+ checkStackIsNotEmpty(listener, MISSING_HOLDER, MAX_ELEMENT_DATA, "", ENTRY);
+
+ int maxElementsValue = getValidMaxElementValue(ctx);
+
+ Parsable tmpData = listener.getParsedDataStack().peek();
+ switch (tmpData.getYangConstructType()) {
+ case LEAF_LIST_DATA:
+ YangLeafList leafList = (YangLeafList) tmpData;
+ leafList.setMaxElelements(maxElementsValue);
+ break;
+ case LIST_DATA:
+ YangList yangList = (YangList) tmpData;
+ yangList.setMaxElements(maxElementsValue);
+ break;
+ default:
+ throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, MAX_ELEMENT_DATA, "", ENTRY));
+ }
+ }
+
+ /**
+ * Validates max element value and returns the value from context.
+ *
+ * @param ctx context object of the grammar rule
+ * @return max element's value
+ */
+ private static int getValidMaxElementValue(GeneratedYangParser.MaxElementsStatementContext ctx) {
+
+ int maxElementsValue;
+
+ String value = removeQuotesAndHandleConcat(ctx.maxValue().getText());
+ if (value.equals(UNBOUNDED_KEYWORD)) {
+ maxElementsValue = Integer.MAX_VALUE;
+ } else if (value.matches(POSITIVE_INTEGER_PATTERN)) {
+ try {
+ maxElementsValue = Integer.parseInt(value);
+ } catch (NumberFormatException e) {
+ ParserException parserException = new ParserException("YANG file error : " +
+ YangConstructType.getYangConstructType(MAX_ELEMENT_DATA) + " value " + value + " is not " +
+ "valid.");
+ parserException.setLine(ctx.getStart().getLine());
+ parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+ throw parserException;
+ }
+ } else {
+ ParserException parserException = new ParserException("YANG file error : " +
+ YangConstructType.getYangConstructType(MAX_ELEMENT_DATA) + " value " + value + " is not " +
+ "valid.");
+ parserException.setLine(ctx.getStart().getLine());
+ parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+ throw parserException;
+ }
+
+ return maxElementsValue;
+ }
+}
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